Mexico knows what happened when they killed Davy Crockett. That would be nothing compared to a Mexican hit on Trump.
Frankly, I don’t worry too much about the Mexicans doing him in as much as the Muslims. Remember a few weeks back a shipment of missiles, intended for Portland, was intercepted in Romania (I believe.) How many other shipments made it to Mexico? It would only take one. His plane is well marked and thus easy to identify and has NO missile defense. The “last minute” decision will work in his favor but until he touches back down on U.S. soil I’ll worry.